Lance went from "deferred until corpus exceeds 5M rows" to verified
production-ready at 10M in a single wave (lakehouse repo commits
7594725 + 5d30b3d). Captures the 4-pack (sanitizer + tests + smoke +
bench) + the root-cause fix (auto-build doc_id btree in migrate handler).
Reframes the strategic question: HNSW at 10M doesn't fit RAM, so the
real choice is Lance vs Parquet+HNSW-with-spilling, deferred until we
have a workload where the Parquet path is the bottleneck.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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